I have the same on a Dutch computer: all ' and " are dead keys that wait for the next key. I hate that, so I have disabled this behaviour all together (I am not sure whether that is what you want). I use Autohotkey hotstrings to write all accents. For example, e// becomes é, e/\ becomes ê, c,, becomes ç, etc. (I could give you a list of my hotstrings if you like). If you want to disable this way of writing accents only for this one combination, and if your hotkey doesn't work, then I don't know how it could be done.
This is how to disable dead-key accents all at once:
In the control panel, go to Regional Settings/languages => Keyboards;
Then click "change keyboards";
Now check whether you also have English installed as a language.
If so, click the drop-down menu and change your language to English;
If not, first click Add... to add English (then pick an English or international keyboard lay-out); then change to English with the drop-down menu.
Now delete the Turkish language that is still in the list (you can add it back in at any time later).
Then reboot.
Note that the menus might be somewhat different on your computer (this is Win7 English).
